ExampleofLoanContract
Loan contract
| Loan contract, refers to a contract where a lender delivers a certain amount of funds to a borrower, and the latter returns the same amount of funds within a certain period of time and pays interests to the lender. There are 6 terms in the contract that consists of two aspects: 1) the borrower shall submit a loan application stating the amount he/she wants to borrow, and 2) the lender may deposit funds into the contract account until the target of loan is reached. Before borrowing, the contract requires that the borrower must confirm the loan information and check the historical loan records, and then calculate the corresponding interests. Meanwhile, the contract asserts that the borrower pays off the loan amount before the loan date comes. |
// Lend Spesc.scs
contract Lend{
- party User{
- loan : Loan
- SubmitLoanApplication(l : Loan)
- confirm()
- getHisLoan()
- payback()
- loan : Loan
- }
- party Funder{
- moneyFunded : Money
- moneyWillGet : Money
- Contribute(uid : User)
- refund(uid : User)
- moneyFunded : Money
- }
- term term1 : User can SubmitLoanApplication.
- term term2 : Funder can Contribute
- when before uid::loan::timelimit
- while deposit $ value <= uid::loan::fundingGoal.
- when before uid::loan::timelimit
- term term3 : Funder can refund
- when after uid::loan::timelimit and uid::loan::amount < uid::loan::fundingGoal
- while withdraw $ his::moneyFunded.
- when after uid::loan::timelimit and uid::loan::amount < uid::loan::fundingGoal
- term term4 : User must confirm
- when within 3 day after his::loan::timelimit and his::loan::amount = his::loan::fundingGoal.
- term term5 : User can getHisLoan
- when after User did confirm
- while withdraw $ his::loan::amount.
- when after User did confirm
- term term6 : User must payback
- when after User did confirm and before his::loan::tenorM
- while
- deposit $ his::loan::balance + his::loan::installment
- transfer $ his::loan::funders::moneyWillGet to his::loan::funders.
- deposit $ his::loan::balance + his::loan::installment
- when after User did confirm and before his::loan::tenorM
- type Loan
- {
- operationName : Name // use of money
- beneficiary : User // Borrower
- timelimit : Date // time limit of collecting money
- fundingGoal : integer // the amount borrower want to borrow
- amount : integer // the money collected now
- balance : integer // the Capital have to pay back
- numFunders : integer
- interestRateM : integer // monthly
- gracePeriod : integer // the period you don't have to pay the interest
- tenorM : integer // you have to pay back tenorM month later
- installment : integer // the interest have to pay back
- funders : set Funder
- operationName : Name // use of money
- }
}
1 /* FunderT.sol */
2 pragma solidity >=0.4.0 <0.6.0;
3
4 contract FunderT{
5
6 uint moneyFunded;
7 uint moneyWillGet;
8
9 address _FunderAddress;
10 uint _max;
11
12 function funderT() public{
13 _max = now*1000;
14 }
15 function regist(address a) public {
16 _FunderAddress = a;
17 }
18
19 function getAddress() public returns (address a){
20 return _FunderAddress;
21 }
22
23 function getmoneyFunded() public returns(uint _result){
24 return moneyFunded;
25 }
26
27 function setmoneyFunded ( uint a) public{
28 moneyFunded = a;
29 }
30
31 /* function getmoneyWillGet() public returns(uint _result){
32 return moneyWillGet;
33 }
34
35 function setmoneyWillGet(uint a) public {
36 moneyWillGet = a;
37 }*/
38
39
40
41 function setmoneyWillGet(uint256 newValue) public {
42 moneyWillGet = newValue;
43 }
44
45
46 function getmoneyWillGet() public view returns (uint256) {
47 return moneyWillGet;
48 }
49 }
1 /* Lend.sol */
2 pragma solidity >=0.4.0 <0.6.0;
3 pragma experimental ABIEncoderV2;
4
5 import "./UserT.sol";
6 import "./FunderT.sol";
7
8 contract Lend {
9
10 UserT User;
11 FunderT Funder;
12 uint start;
13
14
15 mapping (string => Loan) loan;
16
17 struct Loan{
18 bytes32 operationName;
19 address beneficiary;
20 uint timelimit;
21 uint fundingGoal;
22 uint amount;
23 uint balance;
24 uint numFunders;
25 uint interestRateM;
26 uint gracePeriod;
27 uint tenorM;
28 uint installment;
29 address funders;
30 }
31
32
33
34 constructor() public{
35 start = now;
36 User = new UserT();
37 Funder = new FunderT();
38 }
39
40 /* constructor() public{
41 start = now;
42 User = new UserT();
43 Funder = new FunderT();
44 }*/
45
46 modifier onlyUser{
47 require(User.getAddress()==msg.sender);
48 _;
49 }
50
51 modifier onlyFunder{
52 require(Funder.getAddress()==msg.sender);
53 _;
54 }
55
56 modifier term2Modifier(UserT uid){
57 // require(now < uid.loan.timelimit);
58 // require(msg.value <= uid.loan.fundingGoal);
59 _;
60 }
61
62 modifier term3Modifier(UserT uid){
63 // require(now > (uid.loan.timelimit && uid.loan.amount < uid.loan.fundingGoal));
64 _;
65 }
66
67 modifier term4Modifier{
68 // require((now > (User.getloan.timelimit(msg.sender) && User.getloan.amount(msg.sender) == User.getloan.fundingGoal(msg.sender))) &&(now < (User.getloan.timelimit(msg.sender) && User.getloan.amount(msg.sender) == User.getloan.fundingGoal(msg.sender))+259200));
69 _;
70 }
71
72 modifier term5Modifier{
73 require(now > User.confirmTime());
74 _;
75 }
76
77 modifier term6Modifier{
78 // require(now > (User.confirmTime() && now < User.getloan.tenorM(msg.sender)));
79 // require(User.getloan.balance(msg.sender) + User.getloan.installment(msg.sender));
80 _;
81 }
82
83 function SubmitLoanApplication( Loan memory l) onlyUser() public {
84 //USER CODE HERE
85 //CHECK
86
87 }
88
89 function Contribute(UserT uid) onlyFunder() term2Modifier(uid) public payable {
90 //USER CODE HERE
91 //CHECK
92
93 }
94
95 function refund(UserT uid) onlyFunder() term3Modifier(uid) public payable {
96 //USER CODE HERE
97 msg.sender.transfer(Funder.getmoneyFunded());
98 //CHECK
99
100 }
101
102 function confirm() onlyUser() term4Modifier() public {
103 //USER CODE HERE
104 //CHECK
105
106 }
107
108 function getHisLoan() onlyUser() term5Modifier() public payable {
109 //USER CODE HERE
110 msg.sender.transfer(User.getloan().amount);
111 //CHECK
112
113 }
114
115 function payback() onlyUser() term6Modifier() public payable {
116 //USER CODE HERE
117 //User.getloan().funders.transfer(msg.sender);
118 msg.sender.transfer(User.getloan().amount);
119 //CHECK
120
121 }
122
123 }
1 /* UserT.sol */
2 pragma solidity >=0.4.0 <0.6.0;
3 pragma experimental ABIEncoderV2;
4
5
6 import "./Lend.sol";
7
8 contract UserT{
9
10 struct Loan{
11 bytes32 operationName;
12 address beneficiary;
13 uint timelimit;
14 uint fundingGoal;
15 uint amount;
16 uint balance;
17 uint numFunders;
18 uint interestRateM;
19 uint gracePeriod;
20 uint tenorM;
21 uint installment;
22 address funders;
23 }
24
25
26
27
28 Loan loan;
29 //attributes of actionconfirm
30 bool _isconfirmDone;
31 uint _confirmTime;
32
33 address _UserAddress;
34 uint _max;
35
36 constructor ()public{
37 _max = now*1000;
38 }
39
40 function regist(address a) public {
41 _UserAddress = a;
42 }
43
44 function getAddress() public returns (address a){
45 return _UserAddress;
46 }
47
48 function getloan() public returns(Loan memory _result) {
49 return loan;
50 }
51
52 function setloan(Loan memory a) public{
53 loan = a;
54 }
55
56 function confirmDone() public{
57 _confirmTime = now;
58 _isconfirmDone = true;
59 }
60
61 function confirmTime() public returns (uint result){
62 if(_isconfirmDone){
63 return _confirmTime;
64 }
65 return _max;
66 }
67
68 }